Hach AS950 Installation Et Maintenance page 24

Problem
Sample volume is not correct.
24 English
Table 2 General troubleshooting (continued)
Possible cause
Incorrect volume calibration.
Incorrect tube length is specified
in the sampler program.
Intake tube does not fully purge.
Strainer is not fully submerged.
Worn pump tubing and/or roller
assembly.
The liquid detector is disabled.
Liquid detector does not operate
properly.
Solution
Repeat the volume calibration.
Make sure that the correct tube length is in
the sampler program.
Make sure that the intake tube is as vertical
and as short as possible.
Install the shallow depth strainer.
Replace the pump tube and/or roller
assembly.
Set the liquid detector to on and complete a
volume calibration.
Calibrate the liquid detector with the same
liquid that is sampled.